--On Thursday, September 18, 2003 12:02:44 PM +0200 Rene Brun
<Rene.Brun@cern.ch> wrote:
> I don't know what you mean by sigma_y?
> If you just want to draw a set of points with eerrors, use TGraphErrors
> TGraphErrors(n,x,y,ex,ey)
OK. So I guess my question is whether there is an "automated" way of
creating this Graph directly from the ntuple entries (I am used to a tool
that can do it): something like Draw("y:x") but where each point displayed
would have an error bar given by two other ntuple entries "sigmax,sigmay"?
>
II tried the following unamed script (following your suggestion). It is in
"myscript.C"
I log in interactively to root and type
.x myscript.C
but the ntuple points do not appear....
I can send you the root file but it is very basic.
Could it be because I draw a TH1 and try to project a TH2-like onto it? but
why does it work interactively?...
{
TFile *f = new TFile("wmap_fisher.root");
TH1 *hfcl = (TH1*)f->Get("hfcl");
TTree *cl = (TTree*)f->Get("cl");
c1 = new TCanvas("c1","plots",600,600);
gPad->SetBottomMargin(0.15);
gPad->SetLeftMargin(0.16);
hfcl->SetStats(kFALSE);
//titre
hfcl->SetTitleSize(0.05, "x");
hfcl->SetTitleOffset(1., "x");
hfcl->SetTitleSize(0.05, "y");
hfcl->SetTitleOffset(1.5, "y");
hfcl->GetXaxis()->SetTitle("l");
hfcl->GetYaxis()->SetTitle("l(l+1)C_{l}/2#pi (#muK^{2})");
hfcl->SetLineStyle(1);
hfcl->SetLineWidth(1);
hfcl->SetLineColor(13);
hfcl->SetFillColor(13);
hfcl->Draw();
hcl->SetLineColor(16);
cl->Draw("y:x","","same");
////////////////////
c1->Update();
}
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S. Plaszczynski
Laboratoire de l'accélérateur linéaire tel: 01 64 46 85 38
Centre d'Orsay- bat 200 fax: 01 64 46 83 97
BP34- 91989 ORSAY cedex
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